In medicine, a Holter Monitoring Systems (often just Holter) is a form of ambulatory electrocardiography equipment, a portable device for cardiac monitoring (the monitoring of the electrical activity of the cardiovascular system) for at least 24 hours. The Holter is most frequently used to track ECG cardiac activity (electrocardiography or ECG). Its lengthy recording duration can occasionally be helpful for monitoring sporadic cardiac arrhythmias that would be challenging to spot in a shorter timeframe. A cardiac event monitor that may be worn for a month or more can be utilised for individuals who experience more sporadic symptoms.
Experimental physicists Norman J. Holter and Bill Glasscock, who began working on radio telemetry in 1949, created the Holter Monitoring Systems at the Holter Research Laboratory in Helena, Montana, in the US. They refocused their efforts on creating a wearable cardiac monitoring device in the early 1950s after being inspired by a recommendation from physician Paul Dudley White. In 1962, the Holter monitor was made available for purchase.
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